In the protein complex ATP synthase alpha helices pack tight

In the protein complex ATP synthase, alpha helices pack tightly together to form a ring structure. Shown below is a segment of an amino acid sequence alignment of helix 1 of subunit c from several species: Based on this alignment, write the sequence motif [e.g. PxxxRxG) that appears to be essential for structure and/or function.

Solution

By the rule of conservation and non conservation

V/L/I G/A X A/I/L G X G/A A/L/I G X G/A X V/A/L/I X X

Amino acids represent by oblique(s) as well as single amino acid are conserve, while X represents no conservation of amino acid.